/Engine/Plugins/Runtime/Metasound/Source/MetasoundEngine/Public/MetasoundBuilderSubsystem.h
Adds a graph output node with the given name, DataType, and sets output node's input to default value. Returns the new output node's input handle if it was successfully created, or an invalid handle if it failed.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Audio|MetaSound|Builder", Meta=(ExpandEnumAsExecs="OutResult")) [FMetaSoundBuilderNodeInputHandle](API\Plugins\MetasoundEngine\FMetaSoundBuilderNodeInputHandle) AddGraphOutputNode ( [FName](API\Runtime\Core\UObject\FName) Name, [FName](API\Runtime\Core\UObject\FName) DataType, [FMetasoundFrontendLiteral](API\Plugins\MetasoundFrontend\FMetasoundFrontendLiteral) DefaultValue, [EMetaSoundBuilderResult](API\Plugins\MetasoundEngine\EMetaSoundBuilderResult) & OutResult, bool bIsConstructorOutput )